The off-hand call to vote may be by design. It comes amid a precipitous decline in Democratic voter registration in key swing states — nowhere more apparent than in Ohio.

Voter registration in the Buckeye State is down by 490,000 people from four years ago. Of that reduction, 44 percent is in Cleveland and surrounding Cuyahoga County, where Democrats outnumber Republicans more than two to one.

“I think what we’re seeing is a lot of spin and hype on the part of the Obama campaign to try to make it appear that they’re going to cruise to victory in Ohio,” Cuyahoga County Republican Chairman Rob Frost said. “It’s not just Cuyahoga County. Nearly 350,000 of those voters are the decrease in the rolls in the three largest counties, Cuyahoga, Hamilton and Franklin.”

Frost points out that those three counties all contain urban centers, where the largest Democrat vote traditionally has been.

Ohio is not alone. An August study by the left-leaning think tank Third Way showed that the Democratic voter registration decline in eight key swing states outnumbered the Republican decline by a 10-to-one ratio. In Florida, Democratic registration is down 4.9 percent, in Iowa down 9.5 percent. And in New Hampshire, it’s down down 19.7 percent.